Lm2642mtcx/nopb Control Switching Sinc 28tssop Itytarg

Aplicaciones Sistemas integrados, consola/decodificadores de TV
Corriente - Suministro 1mA
Voltaje de la fuente 4.5V ~ 30V
Temperatura de operación -40°C ~ 125°C
Tipo de montaje Montaje en superficie
Paquete / Caja (carcasa) 28-TSSOP (ancho 0.173", 4.40mm)
Paquete del dispositivo del proveedor 28-TSSOP

http://www.ti.com/lit/ds/symlink/lm2642.pdf

FEATURES DESCRIPTION
2 The LM2642 consists of two current mode • Two Synchronous Buck Regulators
synchronous buck regulator controllers with a
• 180° Out of Phase Operation switching frequency of 300kHz.
• 4.5V to 30V Input Range
The two switching regulator controllers operate 180°
• Power Good Function Monitors Ch.1 out of phase. This feature reduces the input ripple
• 37µA Shutdown Current RMS current, thereby significantly reducing the
required input capacitance. The two switching • 0.04% (typical) Line and Load Regulation Error
regulator outputs can also be paralleled to operate as
• Current Mode Control With or Without a Sense a dual-phase single output regulator.
Resistor
The output of each channel can be independently • Independent Enable/Soft-start Pins Allow adjusted from 1.3 to VIN• maximum duty cycle. An Simple Sequential Startup Configuration. internal 5V rail is also available externally for driving
• Configurable for Single Output Parallel bootstrap circuitry.
Operation. (See Figure 3). Current-mode feedback control assures excellent line
• Adjustable Cycle-by-Cycle Current Limit and load regulation and a wide loop bandwidth for
• Input Under-voltage Lockout excellent response to fast load transients. Current is
sensed across either the Vds of the top FET or • Output Over-voltage Latch Protection
across an external current-sense resistor connected
• Output Under-voltage Protection with Delay in series with the drain of the top FET. Current limit is
• Thermal Shutdown independently adjustable for each channel.
• Self Discharge of Output Capacitors When the The LM2642 features analog soft-start circuitry that is
Regulator is OFF independent of the output load and output
• TSSOP package capacitance. This makes the soft-start behavior more
predictable and controllable than traditional soft-start
APPLICATIONS circuits.
A PGOOD1 pin is provided to monitor the dc output • Embedded Computer Systems
of channel 1. Over-voltage protection is available for
• High End Gaming Systems both outputs. A UV-Delay pin is also available to
• Set-top Boxes allow delayed shut off time for the IC during an output
• WebPAD under-voltage event.